The American men continued their dominance of the relay events as they powered to gold in the 4x400m race at the World Championships.
The quartet of Calvin Harrison, Tyree Washington, Derrick Brew and Jerome Young won in 2 minutes 58.88 seconds.
The world 400m champion Jerome Young bided his time before overtaking Jamaica's Michael Blackwood on the final bend to take top spot.
In typical fashion, Marc Raquil of France stormed up the home straight to grab silver for the hosts with Jamaica picking up the bronze.
Britain drafted in 400m hurdler Chris Rawlinson to their quartet after Tim Benjamin injured his hamstring during the warm-up.
Ian Mackie was handed the lead leg before passing the baton to Sean Baldock who did well to keep Britain in contention.
Rawlinson ran strongly but anchor Daniel Caines had too much to do and brought the team home in fifth place.
1. United States (Calvin Harrison, Tyree Washington, Derrick Brew, Jerome Young) 2:58.88.
2. France (Leslie Djhone, Naman Keita, Stephane Diagana, Marc Raquil) 2:58.96.
3. Jamaica (Brandon Simpson, Danny McFarlane, Davian Clarke, Michael Blackwood) 2:59.60.
4. Bahamas (Avard Moncur, Dennis Darling, Nathaniel McKinney, Christopher Brown) 3:00.53.
5. Britain (Ian Mackie, Sean Baldock, Christopher Rawlinson, Daniel Caines) 3:01.00.
6. Spain (Eduardo Ivan Rodrmguez, David Canal, Salvador Rodrmguez, Antonio Manuel Reina) 3:02.50.
7. Greece (Stilianos Dimotsios, Anastasios Gousis, Panayiotis Sarris, Periklis Iakovakis) 3:02.56.
8. Japan (Yuki Yamaguchi, Takahiko Yamamura, Kenji Tabata, Mitsuhiro Sato) 3:03.15.